Electric contact device.



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APPLICATION FILED l 1l, N

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No. 839,027. l PATEITBD IIRC.l 1l, 1903.

1. o. Psnnsnn. -g ELECTRIC CONTACT DEVICE, j

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UNITED STATES PATENT FTiliUE.

Specicaton of Letters Patent,

Patented Bec. 18, 1906.

Application filed April 15,1904. Serial No. 203.312.

"7 all whom t may concern:

Be it known that I, PEDER OL'UF PannasEN, a citizen of the Kingdom ofDenmark, residing in Copenhagen, Denmark, have invented certain new, anduseful Improvements in and Relating to Electric Contact Devices, ofWhich'the following is a specification.

In relatively quick vibrating bodies, the movements of which should beused for closing a contact-for instance, by the resonancerelays known toelectrotechnics-it is dithcult to obtain a sufiiciently goed and lastingcontact, so that the necessary amount of energy might pass through thecontact device.

The present invention relates to a device by which this is obtained in amost easy and simple manner by means of a magnet attracting and, ifdesired, retaining the vibrat- This invention is illustrated intheaccompanjy'ing drawings, in which- Figures 1 and 2 show the'device usedin connection with a resonance-relay of the kind described in theBritishPatent No. 16,810/01. Fig. 3 is a side elevation of the magnetshown in Fig. 2., Figs. 4 to 7 illustrate diiicerent embodiments ofcontact devices acted upon by the vibrating body. Fig. 8 is a View infront elevation of a constructional forni orc device used in practice. Fig. 9 is a view of the same in side elevation. Fig. 10 is a section onthe line A B, Fig. 8. Fig. 1l is a section on the line C D, Fig. 8.

The string c (shown in Fig. l) is suspended between the iixedbinding-screws l) and c and can be brought into vibration in a verticalplane-as, for instance, by a part of the string being placed in amagnetic field, the lines of force of which are perpendicular to theplane of the. vibrations of the string, which is ol metal and throughwhich an alter- Dating or varying current is passed, the frequency'ofwhich current corresponds to that of the string during free vibration.The effects of the current impulses being accumulative, the string soonreaches a considerable amplitude. The string carries a small armature d,which is arranged at a short distance from a magnet e, which latter, onaccount of the tensile strength of the string, is unable to attract thearmature d when the string is in a position of rest. However, when thestring is brought into vibration it will by its vibration soon get sonear to the magnet e that tl.. armature d will be attracted and retainedby same, By the contact between armature and magnet hereby produced alocal circuit is closed, as shown in Fig. 2, wherein the batteryfisclosed through a working apparatus g as soon as the armature zy isbrought in conv tact with the magnet which is here an elec'- tromagnet,and which may be energized, as usual, from some suitable source ofelectrlcl ty. The magnet-circuit may be interrupted automatically assoon as the auparatus g has operated, and the string is t en releasedand is again ready to repeat the cycle. If the string be made of iron orsteel, the armature is superfluous.

It has been proved .most practical to usel an electromagnet the poles oiwhich are bent' closely together, Fig. 23. Sometimes'it might besuitable to use as contacts twf` Lixed pieces fi, between which thcstring, or possibl a contact-piece lo, insulated from the string, makesor breaks the circuit, Fig. 4.

In Fig. 5 the contact is caused bythe string c acting upon a resilientcontact m n, which is independent of the attracting-magnet. In Fig. 6 isshown how the string a by its vibration can cause the interruption ofthe already-existing contact made between the resilient contact-pieces oand p by acting upon the contact-piece y).

Again, Fig. 'ls'hows a combination of both of the devices shown in Figs.5 and 6, the

strin bein(r ca )able of causinfr the interru tion of a contact betweenthe contact-pieces g and fr and of then closing a Contact between thecontactpieces r and s. It must still be remarked that it is possible todevise the apparatus in such a manner that the magnet which causes themovements orc the vibrating body can be used at the same time as aretaining-magnet.

in the modification shown' in Fig. 8 the string t is fastened in abinding-screw 1L and placed over the insulating-prisms /U and w andcarries a weight fc. A small weight y is placed on or near the middle ofthc strip. The magnet .e produces a powerful magnetic 'field between thepole-pieces l. The core and thc pole-pieces 3 oi an clectromagnet 2 areplaced in circuit with the metal plate 4, to which thc above-mentioncdparts are fastened. As seen from Fig. l0, the string is placed at thecenter of the field, due to the magnet e, while in Fig. ll it is shownplaced over the pole-pieces` ofthe electromagnet 2.

The device acts in the following manner: /Vhen an alternating current ora Varying direct current of a frequency corresponding to lOO 1o cuitclosed by the contact has. .permitted the currentto perform itsfunction, the current to the magnet 2 is interrupted, by which thestring is set free. The weight y serves to increase the mass of thevibratile body, and

r 5 thus permits the amplitude of vibration of the body to more rapidlyincrease.

Having thus described my invention, I claim as new and desire to secureby'Letters Patentl. A relay for pulsating or alternating our# rentscomprising a conducting-body capable of vibrating with a deiiniteperiodicity, a magnet, and means whereby currents may be passed throughsaid body, said body having a magnetic portion by which it is attractedand held to said magnet when its vibrations have vincreased toapredetermined amount.

2. A relay for pulsating or alternating currents ,comprising aconducting-body capable of vibrating with a deiinite periodicity, amagnet, means whereby currents may be passed through said body7 saidbody having a magnetic portion by which it is attracted and held to saidmagnet when its vibrations have increased to a predetermined amount, anda local circuit arranged to be closed when the body is in such heldrelation to the magnet.

1n testimony that I claim the foregoing as my invention l have signed myname in presence of two subscribing witnesses.

FEDER OLUF PEDERSEN; Witnesses z CEoiL VILHELM SoHoU, FLEMMING ALGREERUSPIRG.

